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N. C. MICKELSON.

Patented Aug. 29, 19H).

G ow mm mechanism therein. Fig. 2 is a detail sectional view on an enlargedscale of the sup- HI ELS C. MICKELSON, 01? DENVER, COLORADO, ASSIG-NOR TO THE DENVER ROCK DRILL MANUFACTURING GQMPANY, 0F DENVER, COLORADO, A CORPORATION OF DELA- wane.

' ROCK-DRILL.

Specification of Letters Patent. Patented Aug; 29, 1916,

Application filed April 26, 1915. Serial No. 24,063.

To all whom it may concern:

Be it known that I, NIELS C. MrcKnLsoN,

a citizen of the UnitedStates, residing at Denver, in the county of Denver and State of Colorado, have invented new and useful Improvements in Rock-Drills, of which the following is a specification.

The present invention relates more par-- ticularly to means for controlling the supply of cleansing fluid to a drill hole made by the drilling mechanism, and the object is to provide novel, simple and practicable means by which the normal supply of cleansing fluid can be greatly "augmented, as is very desirable under certain conditions of work.

The embodiment of the invention that is at present considered preferable, is illustrated in. the acc ijmpa nying drawings, wherein I Figure 1 is a longitudinal sectional view through a drill, showing the said cleansing plemental cylinder and piston for operating the controlling valve; element. Fig. ,3 is'a' view similar to Fig. 2, but showing a slightly modified form of construction.

Similar refenrnce numerals designate cor-. responding parts in all the figures of. the drawings. e

In the embodiment illustrated,- a cylinder member 4 is employed, in which operates a reciprocatory hammer piston 5 having an extended reduced hammer portion .6 that enters a chuck 7 and operateson a drill bit placed in the chuck, a portion ofsaid drill bit being shown at 8. The drill bit has an axial conduit 9 therethrough focthe passage of cleansing fluid to the bottom of the hole bcing drilled.

The piston 5 is provided with an internal constant pressure chamber 10 and ports 11 for distributing fluid under pressure from the chamber 10 to opposite sides of the pis ton 5, for the purpose of reciprocating the same. It is believed to be unnecessary to enter into a detailed description of the construction and operation of the motor mecha nism, as the same constitutes the subjectmatter of a co-pending application, Serial No. 875,465, filed Dec. 5, 1914.

The fluidunder pressure is supplied to the constant pressure chamber 10 by a tube 12' which projects into said chamber, said tube having a rear flanged end 13 clamped between the rear head 14 of the cylinder memher and a lubricator body 15 mounted on the rear end of said cylinder member. The fluid under pressure conducted from any suitable source, finds access to the tube 12 from a coupling 16 threaded into one side of the head 14, the said head 14 and'fiange 13 having portions spaced apart to provide a channel 17 leading from the coupling 16 to the bore of the tube 12. A portion of the fluid under vpressure which enters the constant pressure chamber 10 is diverted for cleansing purposes to the bore 9 of the drill bit, and to this-end, the piston 5' ha's"a longitudinal conduit 18 extending from' the chamber 10 through the front end of the same, being alined with the bore 9.

The rear side of the cylinder head 14 is provided with a socket 19 that is internally threaded, and screwed into said socket is asecond cylinder member 20 in the form of a plug having a bore 21 constituting a piston chamber in which operates a reciprocatory piston 22. This piston is mounted on a rod 23 that extends longitudinally through the sleeve 12 and constant pressure chamber 10 into the rear end of the conduit18, the front end of said rod being preferably; tapered as illustrated at 24. The rod, as clearly shown is of considerably less diameter than the bore of the sleeve 12, and'of the cross sectional area of the pressure chamber 10.

is also of slightly less diameter than the rear end of the conduit 18, sothat fluid may pass around the same and escape from the conduit 18 into the bore Set the drill bit 8. The piston 22 is of slightly less diameter than the piston chamber 21, so as to permit leakage of fluid under pressure past said piston to the rear side of the same and the opening through which the rod 23 passes carrying a -suitable knob 29. A spring serves to normally maintain the valve 27 in its closed position.

Under normal conditions, the parts will be as illustrated in Figs. 1 and 2. That is to say, the piston 22 will be in its foremost position, and consequently the front end 24 I of the rod will be in the rear end of the conduit 18, even when the hammer piston 5 is in its foremost position. With the parts as shown, it will be evident that if fluid under pressure is admitted to the constant as will be obvious, is

pressure chamber 10, the hammer piston 5 will be reciprocated and will operate on the drill bit 8, while a portion of the fluid will flow through the conduit 18 into the bore 9 of the drill bit, and thus pass to the bottom of the drill hole, driving out the cuttings. In case a greater supply of cleansing fluid is desired, the operator has only to press upon the knob 29 of the valve 27, whereupon the exhaust port 26 will be opened, and pressure against the rear side of the} piston 22 will be relieved. As a conse-j quence, the pressure against the front side of the piston 22 will cause. a rearward niovement of the said piston, carrying the rod 23 with it to the position illustrated in dotted lines. The conduit 18 will thus be unobstructed and a relatively large amount of fluid under pressure will pass there-,

through to the drill bit.

Instead of having the piston 22 provided with a loose fit, the fluid for holding the piston in its foremost position may be supplied by a'channel formed in the cylinder wall. The structure illustrated in Fig. 3 indicates such a modificatibn. The rear cylinder head is designated 14 and the supplemental cylinder member 20. The piston for operating the valve element is shown at 22? and the valve rod is designated 23. The relief valve is shown at 27. ture, it will be noted that the fluid under pressure is conveyed to the rear face of the piston 22? by a channel 28. The operation, precisely the same as that already described.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it'will be understood that various changes in the size, shape, proportion and minor details of con- In this strucstruction, may be resorted to Without departing from the spirit of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure bv Letters Patent is:-

1. In apparatus of the character set forth, the combination with drilling mechanism including a cylinder member and a drill operating piston therein, of means for supplying fluid under pressure to the cylinder member to actuate the piston, means for supplying cleansing fluid to a drill bit operated on by the piston, a valve controlling the cleansing fluid supply, motive fluid operated means for actuating the valve, means for supplying motive fluid to said motive fluid operated means, and means for governing the motive fluid supply to the valve actuating means independently of the supply to the cylinder member.

2. In apparatus of the character set forth, the combination with drilling mechanism including a cylinder member and a drill operating piston therein, of means for sup plyingcleansing fluid to a drill bit operated on by the piston, a valve controlling the cleansing fluid supply, fluid actuated means for actuating the valve, means for supplying actuating fluid to both the cylinder member and the valve actuating means, and means for controlling the supply to one of the latter independently'of the other.

3. In apparatus of the character set forth, the combination with drilling mechanism including a cylinder member and a drill operating piston therein, of means for directing cleansing fluid to a drill bit operated on by the piston, a valve controlling the directing means, fluid actuated means for actuating the valve, means for supplying fluid under pressure to the cylinder member, the directing means and the valve actuating means, and means for controlling the supply of fluid to the valve actuating means independently of that supplied to the cleansing means and cylinder member.

4.- Inapparatus of the character set forth, the combination with a cylinder member and a drill operating piston therein, of means for directing cleansing fluid to a drill bit operated on by the piston, a valve for varying the fluid so directed, fluid operated means for actuating the valve, and common means connected to the cylinder member for supplying actuating fluid to the cylinder member and valve actuating means and also to the cleansing fluid directing means.

5. In apparatus of the character set forth, the combination with a cylinder member and a piston operating therein, of means for supplying fluid under pressure to the apparatus, directing a portion thereof to the cylinder member to operate the piston,

and directing a portion through the piston to a drill bit operated on by the piston, and fluid actuated means for controlling the supply of cleansing fluid through said piston.

G. In apparatus of the character set forth, the combination with a cylinder member and a. drill operating piston therein, of means for directing cleansing fluid to a drill bit operated on by the piston, a valve controlling the passage of cleansing fluid through the directing means, lluid actuated means for operating the valve, a fluid supply, means for directing a portion of the fluid supply to said directing means, and a portion to the fluid actuated means for the valve, and means for controlling the latter portion.

7. In apparatus of the character set forth, the combination with a cylinder member and a piston operating therein, of means for delivering cleansing fluid to a drill bit operated on by the piston, a valve element for controlling the cleansing fluid, a piston connected to said valve element, means for supplying fluid to both sides of the piston to normally maintain. the valve element in one position, and means for exhausting the fluid on one side of the piston to cause its movement, and thereby the movement of the valve.

8. In aliiparatus of the character set forth, the combination with a cylinder member and a piston operating therein, of means for supplying fluid under pressure and di. trihuting it to cause the operation of the piston, means for diverting a portion of said fluid under pressure to the drill bit, a valve element for controlling the said diverted portion, a piston connected to said valve element fo operating it, means for supplying fluid to both sides of the piston to normally maintain the valve in one position, and a reliet' valve for permitting the exhaust of the fluid on one side of the piston to cause the movement of the pist n, and thereby the movement of the 'alve.

J. In apparatus of the character set forth, the combination with a cylinder member and a piston operating therein, of means for delivering cleansing fluid through the piston to a drill bit operated on lay said piston, a valve element extending into the pisten for controlling the passa ot' fluid, a second cylinder member, a p don therein connected to the valve, and n. -:ans for etfecting the operation of the second piston, to operate the valve 10. In apparatus of the character set forth, the combination with a cylinder memher and a piston operating therein, of a con duit formed in the piston and moving therewith for delivering cleansing fluid to a drill bit operated on by the piston, a second cylinder member at the rear end of the first cylinder member, a piston operating there in. and a "alve element connected to the second piston, said valve element extending into the first mentioned piston and controlling the conduit thereof.

11. in apparatus of the character set forth the combination with a cylinder member and a piston operating therein, said piston having an internal constant pressure chamber, of mean for supplying iluid under pressure to the rhaniber, means for distributing fluid from the chamber to actuate the, piston, a com duit extending through the piston for sup" plying cleansing fluid from the constant ton having an internal constant pressure chamber and conduit leading from the chamber and. delivering cleansing fluid to a. drill bit operated on by the piston, a tube extending into the constant pressure chamher for Puppiying fluid under pressure thereto, a second cylinder member mounted on the rear end of the first. mentioned cylin der member, a piston operating in the second cylinder member, a valve rod secured to the piston, extending through the tube and constant pressure chamber and entering the conduit to control the passage of fluid therethrough, said second eylimler member having meai'is for admitting fluid under pressure to both sides of the piston, and a relief valve mounted in the rear end of the second cylinder member for permitting the exhaust from one side of the piston.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

"1115 M H. Lnormnn,

Tnnnnn. 

